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I would do them all and start at the furthest wheel away from the master cylinder. I usually spray some penetrating oil or WD40 on the bleeder screws the night before and then they should open up easier.

You could always just bleed the one and see what kind of pedal you have though, you might get away with just the one.

It depends on when the last time the brakes were bled. Some folks never bleed the brake system completely but I am a believer in having clean uncontaminated brake fluid.
I would say if the fluid in the Master cylinder reservoir is clean than just bleed that wheel and maybe the opposite wheel also.

Brake fluid captures moisture so it is a good idea to get rid of that moisture every year or so.

I know that is not what you want to hear but it is just just another opinion.

When it's caliper replacement time, the others usually aren't far behind on maintenance (pads, grease pins, check seals, etc.) ... to spend a bit more time checking (and bleeding) those too is time well spent IMHO.

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